/*
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 * and open the template in the editor.
 */
package servlets;

import algos.BinomialTreeModel;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import algos.BlackScholesModel;
import algos.NumIntModel;
import algos.SimulationModel;
import java.io.File;
import java.io.FileNotFoundException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import model.Algorithm;
import model.Algorithm.OptionType;
import model.GraphModel;
import model.PointModel;

/**
 *
 * @author Administrator
 */
public class PricerCTRLServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        RequestDispatcher requestDispatcher = request.getRequestDispatcher("LoadAlgoServlet");

        try {
            String companyTicker = request.getParameter("companyTicker");
            double currentStockPrice = Double.parseDouble(request.getParameter("currentStockPrice"));
            double strikePrice = Double.parseDouble(request.getParameter("strikePrice"));
            double term = Double.parseDouble(request.getParameter("term"));
            double riskFreeRate = Double.parseDouble(request.getParameter("riskFreeRate"));
            double volatility = Double.parseDouble(request.getParameter("volatility"));

            List<Algorithm> allAlgorithms = getAlgorithmObjects();
            List<Algorithm> requestedAlgorithms = new ArrayList<Algorithm>();
            for (Algorithm algorithm : allAlgorithms) {
                String algoRequest = request.getParameter("use-" + algorithm.getAlgoName());
                if (algoRequest != null && !"".equalsIgnoreCase(algoRequest) && "ON".equals(algoRequest)) {
                    requestedAlgorithms.add(algorithm);
                }
            }

            List<Class> classes = getAlgorithmClasses();
            for (Algorithm algorithm : requestedAlgorithms) {
                //get algo's constructor
                Constructor<? extends Algorithm> a = algorithm.getClass().getConstructor(String.class, double.class, double.class, double.class, double.class, double.class, double[].class);
                //get option type
                String optionType = (String) request.getParameter("ddl-" + algorithm.getAlgoName());
                optionType = optionType.substring(optionType.length() - 4, optionType.length());
                //get extra paras
                HashMap<String, Double> extraParameters = algorithm.getExtraParameters();
                Iterator iterator = extraParameters.entrySet().iterator();
                ArrayList<Double> extraParametersInput = new ArrayList<Double>();
                while (iterator.hasNext()) {
                    Map.Entry pairs = (Map.Entry) iterator.next();
                    extraParametersInput.add(Double.parseDouble(request.getParameter(algorithm.getAlgoName() + "-" + pairs.getKey())));
                }
                double[] extraParametersInputFormatted = new double[extraParametersInput.size()];
                for (int i = 0; i < extraParametersInput.size(); i++) {
                    extraParametersInputFormatted[i] = extraParametersInput.get(i);
                }
                //create new algo
                Algorithm resultAlgorithm = a.newInstance(companyTicker, currentStockPrice, strikePrice, term, volatility, riskFreeRate, extraParametersInputFormatted);
                boolean isCallOption = false;
                if ("CALL".equals(optionType)) {
                    request.setAttribute(resultAlgorithm.getAlgoName() + "-Result", resultAlgorithm.calculateCallPrice());
                    isCallOption = true;
                } else {
                    request.setAttribute(resultAlgorithm.getAlgoName() + "-Result", resultAlgorithm.calculatePutPrice());
                }
                
                //get graph option
                String graphOption = (String) request.getParameter("smile-" + algorithm.getAlgoName());
                if (graphOption != null && !"".equalsIgnoreCase(graphOption) && "ON".equals(graphOption)) {
                    GraphModel graphModel = new GraphModel(resultAlgorithm.getAlgoName() + " Graph", resultAlgorithm, isCallOption);
//                    for(PointModel x:graphModel.getPointsArray()){
//                        out.println(x.getPrice());
//                    }
                    request.setAttribute(resultAlgorithm.getAlgoName() + "-GraphModel", graphModel);
                }
            }

            requestDispatcher.forward(request, response);

        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InstantiationException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalArgumentException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvocationTargetException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            out.close();
        }
    }

    private List<Class> getAlgorithmClasses() {
        List<Class> classes = new ArrayList<Class>();

        try {
            File file = new File(getServletContext().getRealPath("/AlgoConfig/Algos.csv"));
            Scanner scanner = new Scanner(file);
            while (scanner.hasNext()) {
                classes.add(Class.forName(scanner.nextLine()));
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            return classes;
        }
    }

    private List<Algorithm> getAlgorithmObjects() {
        ArrayList<Algorithm> algorithms = new ArrayList<Algorithm>();
        try {
            //out.println(getServletContext().getRealPath("/AlgoConfig/Algos.csv"));
            List<Class> classes = getAlgorithmClasses();
            for (Class c : classes) {
                algorithms.add((Algorithm) c.newInstance());
            }
        } catch (InstantiationException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            return algorithms;
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);

    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
